Juice processing

Tressler, D. K. and Joslyn, M. A., Fruit and Vegetable Juice Processing Technology, Avi. Westport (1968)... 

Figure 3 Size fractionation of EDTA-soluble polyuronides from Rutgers and transgenic fruit juice processed by cold- and hot-break methods. Pectin from processed juice was extracted as ethanol-insoluble solids and size fractionated on a Sepharose CL4B column. Under the same chromatographic conditions, elution of the branched dextrans with average molecular mass 2000, 500, 252, 151, 40 and 17.7 kD-peaked in fraction number 46, 50, 54, 62, 67 and 72, respectively. Modified from Thakur et al. [23].

In this presentation, we will take examples of different fruit juice processes and will try to relate enzyme activities, the role they play and the transformation they occur in terms of finished products. These examples will concern apple juice, french cider, pineapple and wine. 

From application trials it was clear that addition of RGase containing fiactions when used in combination with other pectinases has a beneficial effect on file apple-juice process. 

Application Paint recovery Whey processing Biologicals Water treatment Juice processing... 

Batch or Fed-Batch Operation This mode of operation is typical of biologicals and juice processing where high solicfs and low fluxes require multiple passes, and batch operation is characteristic of the manufacturing process. Formulas in Table 20-19 can be used to calculate the required volume reduction factor X, diafiltration volumes... 

Odriozola-Serrano I, Soliva-Fortuny R, Hernandez-Jover T and Martfn-Belloso O. 2009. Carotenoid and phenolic profile of tomato juices processed by high intensity pulsed electric fields compared with conventional thermal treatments. Food Chem 112 258-266. 

Wilson, E. L. and Burns, D. J. W. (1983). Kiwifruit juice process using heat treatment techniques and ultrafiltration. J. Food Sci. 48,1101-1105. 

Hasan, F., Kitagawa, M., Kumada, Y., Hashimoto, N., Shiiba, M., Katoh, S., and Terashima, M. (2006). Production kinetics of angiotensin-I converting enzyme inhibitory peptides from bonito meat in artificial gastric juice. Process Biochem. 41,505-511. 

Fruit juices processing may seriously affect flavanol content. For example, the preparation of commercial apple juice decreased the flavanol content in a stepwise manner. In particular, crushing and pressing, storage of the concentrated juice at room temperature and decolorization by treatment with activated carbon destroy the flavanols almost entirely [46]. 

WaLanabe, A.. Kimina, S., and S. Kitnura Flux Resiotation of Reveise-Osinosis Mentbt anes by Inlermilieui Laieial Suiface Flushing lot Orange Juice Processing, Jml. of Food Science, 43. 3, 985—988 (1978). 

Nagy, S., Chen, C.S., and Shaw, P.E. 1993. Fruit Juice Processing Technology. AgScience, Aubumdale, Fla. 

It is not intended to give a detailed description here of juice processing. The subject is covered in Chapter 3 of this volume and in other volumes such as Fruit... 

The main citrus varieties for juice processing are the orange, lemon, lime and grapefruit. 

Amylases. In the case of pome fruits other enzyme activities are sometimes required. When fruit has been picked before maturity and then ripened under controlled atmospheric conditions in a cool store, there is a likelihood of starch retention originating from the unripe fruit. This starch can become gelatinised during juice processing and can give rise to precipitation and haze effects in the final product. Amylases are used here to break down any residual starch and overcome such problems. 

Juice processing following extraction, cleaning and clarification... 

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